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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Distribution of Bacillus thuringiensis subsp. israelensis in Soil of a Swiss Wetland Reserve after 22 Years of Mosquito Control
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Distribution of Bacillus thuringiensis subsp. israelensis in Soil of a Swiss Wetland Reserve after 22 Years of Mosquito Control

机译：苏云金芽孢杆菌亚种的分布。灭蚊22年后瑞士湿地保护区土壤中的以色列

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摘要

Recurrent treatments with Bacillus thuringiensis subsp. israelensis are required to control the floodwater mosquito Aedes vexans that breeds in large numbers in the wetlands of the Bolle di Magadino Reserve in Canton Ticino, Switzerland. Interventions have been carried out since 1988. In the present study, the spatial distribution of resting B. thuringiensis subsp. israelensis spores in the soil was measured. The B. thuringiensis subsp. israelensis concentration was determined in soil samples collected along six transects covering different elevations within the periodically flooded zones. A total of 258 samples were processed and analyzed by quantitative PCR that targeted an identical fragment of 159 bp for the B. thuringiensis subsp. israelensis cry4Aa and cry4Ba genes. B. thuringiensis subsp. israelensis spores were found to persist in soils of the wetland reserve at concentrations of up to 6.8 log per gram of soil. Continuous accumulation due to regular treatments could be excluded, as the decrease in spores amounted to 95.8% (95% confidence interval, 93.9 to 97.7%). The distribution of spores was correlated to the number of B. thuringiensis subsp. israelensis treatments, the elevation of the sampling point, and the duration of the flooding periods. The number of B. thuringiensis subsp. israelensis treatments was the major factor influencing the distribution of spores in the different topographic zones (P < 0.0001). These findings indicated that B. thuringiensis subsp. israelensis spores are rather immobile after their introduction into the environment.
机译：苏云金芽孢杆菌亚种的复发治疗。以色列需要控制泛滥的蚊子伊蚊（Aedes vexans），该蚊在瑞士提契诺州Bolle di Magadino保护区的湿地中大量繁殖。自1988年以来一直进行干预。在本研究中，苏云金芽孢杆菌静止亚种的空间分布。测量土壤中的以色列孢子。苏云金芽孢杆菌亚种。确定了沿周期性淹没区内不同高度的六个样点收集的土壤样品中的以色列浓度。共处理了258个样品，并通过定量PCR分析，以苏云金芽孢杆菌亚种的159 bp相同片段为靶标。以色列cry4Aa和cry4Ba基因。苏云金芽孢杆菌亚种。发现以色列孢子在湿地保护区的土壤中持续存在，其浓度高达每克土壤6.8 log。由于孢子减少达95.8％（95％置信区间，从93.9到97.7％），因此可以排除由于常规治疗而导致的持续积累。孢子的分布与苏云金芽孢杆菌亚种的数量有关。以色列的处理方法，采样点的高度和洪水持续时间。苏云金芽孢杆菌亚种数以色列处理是影响不同地形区孢子分布的主要因素（ P <0.0001）。这些发现表明 B。苏云金亚种以色列孢子在引入环境后相当不动。

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